y acer aspire 7740 randomly switches off

  Sean Gill 22:59 17 Jan 2018

My acer aspire 7740 randomly switches off, i have checked similer problems on this forum but no luck, it may stay on 40 mins but mostly 5 mins or less, when works fine fan works ok rseated cpu thermal paste charger works battery ok have swapped hard drives removed dust.... any help appreciated

thanks sean

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